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<h1 class="title">mouse.cpp 示例文件</h1>
<span class="subtitle">graphicsview/collidingmice/mouse.cpp</span>
<!-- $$$graphicsview/collidingmice/mouse.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;mouse.h&quot;</span>

  <span class="preprocessor">#include &lt;QGraphicsScene&gt;</span>
  <span class="preprocessor">#include &lt;QPainter&gt;</span>
  <span class="preprocessor">#include &lt;QRandomGenerator&gt;</span>
  <span class="preprocessor">#include &lt;QStyleOption&gt;</span>
  <span class="preprocessor">#include &lt;qmath.h&gt;</span>

  <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> Pi <span class="operator">=</span> M_PI;
  <span class="keyword">const</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> TwoPi <span class="operator">=</span> <span class="number">2</span> <span class="operator">*</span> M_PI;

  <span class="keyword">static</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> normalizeAngle(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> angle)
  {
      <span class="keyword">while</span> (angle <span class="operator">&lt;</span> <span class="number">0</span>)
          angle <span class="operator">+</span><span class="operator">=</span> TwoPi;
      <span class="keyword">while</span> (angle <span class="operator">&gt;</span> TwoPi)
          angle <span class="operator">-</span><span class="operator">=</span> TwoPi;
      <span class="keyword">return</span> angle;
  }

  Mouse<span class="operator">::</span>Mouse()
      : angle(<span class="number">0</span>)<span class="operator">,</span> speed(<span class="number">0</span>)<span class="operator">,</span> mouseEyeDirection(<span class="number">0</span>)<span class="operator">,</span>
        color(<span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">256</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">256</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">256</span>))
  {
      setRotation(<span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">360</span> <span class="operator">*</span> <span class="number">16</span>));
  }

  <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> Mouse<span class="operator">::</span>boundingRect() <span class="keyword">const</span>
  {
      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> adjust <span class="operator">=</span> <span class="number">0.5</span>;
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">18</span> <span class="operator">-</span> adjust<span class="operator">,</span> <span class="operator">-</span><span class="number">22</span> <span class="operator">-</span> adjust<span class="operator">,</span>
                    <span class="number">36</span> <span class="operator">+</span> adjust<span class="operator">,</span> <span class="number">60</span> <span class="operator">+</span> adjust);
  }

  <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> Mouse<span class="operator">::</span>shape() <span class="keyword">const</span>
  {
      <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path;
      path<span class="operator">.</span>addRect(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">40</span>);
      <span class="keyword">return</span> path;
  }

  <span class="type">void</span> Mouse<span class="operator">::</span>paint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span><span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>)
  {
      <span class="comment">// Body</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(color);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">20</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">40</span>);

      <span class="comment">// Eyes</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">8</span>);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="number">2</span><span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">8</span><span class="operator">,</span> <span class="number">8</span>);

      <span class="comment">// Nose</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="operator">-</span><span class="number">22</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>));

      <span class="comment">// Pupils</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="operator">-</span><span class="number">8.0</span> <span class="operator">+</span> mouseEyeDirection<span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>));
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="number">4.0</span> <span class="operator">+</span> mouseEyeDirection<span class="operator">,</span> <span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">4</span>));

      <span class="comment">// Ears</span>
      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(scene()<span class="operator">-</span><span class="operator">&gt;</span>collidingItems(<span class="keyword">this</span>)<span class="operator">.</span>isEmpty() <span class="operator">?</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkYellow : <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="operator">-</span><span class="number">17</span><span class="operator">,</span> <span class="operator">-</span><span class="number">12</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> <span class="number">16</span>);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawEllipse(<span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">12</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> <span class="number">16</span>);

      <span class="comment">// Tail</span>
      <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">20</span>));
      path<span class="operator">.</span>cubicTo(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">22</span><span class="operator">,</span> <span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">22</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">25</span>);
      path<span class="operator">.</span>cubicTo(<span class="number">5</span><span class="operator">,</span> <span class="number">27</span><span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">30</span>);
      path<span class="operator">.</span>cubicTo(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">42</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">35</span>);
      painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
      painter<span class="operator">-</span><span class="operator">&gt;</span>drawPath(path);
  }

  <span class="type">void</span> Mouse<span class="operator">::</span>advance(<span class="type">int</span> step)
  {
      <span class="keyword">if</span> (<span class="operator">!</span>step)
          <span class="keyword">return</span>;
      <span class="comment">// Don't move too far away</span>
      <span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span> lineToCenter(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> mapFromScene(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
      <span class="keyword">if</span> (lineToCenter<span class="operator">.</span>length() <span class="operator">&gt;</span> <span class="number">150</span>) {
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> angleToCenter <span class="operator">=</span> std<span class="operator">::</span>atan2(lineToCenter<span class="operator">.</span>dy()<span class="operator">,</span> lineToCenter<span class="operator">.</span>dx());
          angleToCenter <span class="operator">=</span> normalizeAngle((Pi <span class="operator">-</span> angleToCenter) <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">2</span>);

          <span class="keyword">if</span> (angleToCenter <span class="operator">&lt;</span> Pi <span class="operator">&amp;</span><span class="operator">&amp;</span> angleToCenter <span class="operator">&gt;</span> Pi <span class="operator">/</span> <span class="number">4</span>) {
              <span class="comment">// Rotate left</span>
              angle <span class="operator">+</span><span class="operator">=</span> (angle <span class="operator">&lt;</span> <span class="operator">-</span>Pi <span class="operator">/</span> <span class="number">2</span>) <span class="operator">?</span> <span class="number">0.25</span> : <span class="operator">-</span><span class="number">0.25</span>;
          } <span class="keyword">else</span> <span class="keyword">if</span> (angleToCenter <span class="operator">&gt;</span><span class="operator">=</span> Pi <span class="operator">&amp;</span><span class="operator">&amp;</span> angleToCenter <span class="operator">&lt;</span> (Pi <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">2</span> <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">4</span>)) {
              <span class="comment">// Rotate right</span>
              angle <span class="operator">+</span><span class="operator">=</span> (angle <span class="operator">&lt;</span> Pi <span class="operator">/</span> <span class="number">2</span>) <span class="operator">?</span> <span class="number">0.25</span> : <span class="operator">-</span><span class="number">0.25</span>;
          }
      } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">::</span>sin(angle) <span class="operator">&lt;</span> <span class="number">0</span>) {
          angle <span class="operator">+</span><span class="operator">=</span> <span class="number">0.25</span>;
      } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">::</span>sin(angle) <span class="operator">&gt;</span> <span class="number">0</span>) {
          angle <span class="operator">-</span><span class="operator">=</span> <span class="number">0.25</span>;
      }

      <span class="comment">// Try not to crash with any other mice</span>
      <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">&gt;</span> dangerMice <span class="operator">=</span> scene()<span class="operator">-</span><span class="operator">&gt;</span>items(<span class="type"><a href="../qtgui/qpolygonf.html">QPolygonF</a></span>()
                                                         <span class="operator">&lt;</span><span class="operator">&lt;</span> mapToScene(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)
                                                         <span class="operator">&lt;</span><span class="operator">&lt;</span> mapToScene(<span class="operator">-</span><span class="number">30</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>)
                                                         <span class="operator">&lt;</span><span class="operator">&lt;</span> mapToScene(<span class="number">30</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>));
      foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item<span class="operator">,</span> dangerMice) {
          <span class="keyword">if</span> (item <span class="operator">=</span><span class="operator">=</span> <span class="keyword">this</span>)
              <span class="keyword">continue</span>;

          <span class="type"><a href="../qtcore/qlinef.html">QLineF</a></span> lineToMouse(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> mapFromItem(item<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
          <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> angleToMouse <span class="operator">=</span> std<span class="operator">::</span>atan2(lineToMouse<span class="operator">.</span>dy()<span class="operator">,</span> lineToMouse<span class="operator">.</span>dx());
          angleToMouse <span class="operator">=</span> normalizeAngle((Pi <span class="operator">-</span> angleToMouse) <span class="operator">+</span> Pi <span class="operator">/</span> <span class="number">2</span>);

          <span class="keyword">if</span> (angleToMouse <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> angleToMouse <span class="operator">&lt;</span> Pi <span class="operator">/</span> <span class="number">2</span>) {
              <span class="comment">// Rotate right</span>
              angle <span class="operator">+</span><span class="operator">=</span> <span class="number">0.5</span>;
          } <span class="keyword">else</span> <span class="keyword">if</span> (angleToMouse <span class="operator">&lt;</span><span class="operator">=</span> TwoPi <span class="operator">&amp;</span><span class="operator">&amp;</span> angleToMouse <span class="operator">&gt;</span> (TwoPi <span class="operator">-</span> Pi <span class="operator">/</span> <span class="number">2</span>)) {
              <span class="comment">// Rotate left</span>
              angle <span class="operator">-</span><span class="operator">=</span> <span class="number">0.5</span>;
          }
      }

      <span class="comment">// Add some random movement</span>
      <span class="keyword">if</span> (dangerMice<span class="operator">.</span>size() <span class="operator">&gt;</span> <span class="number">1</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> <span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">10</span>) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
          <span class="keyword">if</span> (<span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">1</span>))
              angle <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">1</span> <span class="operator">/</span> <span class="number">500.0</span>);
          <span class="keyword">else</span>
              angle <span class="operator">-</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">1</span> <span class="operator">/</span> <span class="number">500.0</span>);
      }

      speed <span class="operator">+</span><span class="operator">=</span> (<span class="operator">-</span><span class="number">50</span> <span class="operator">+</span> <span class="type"><a href="../qtcore/qrandomgenerator.html">QRandomGenerator</a></span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">100</span>)) <span class="operator">/</span> <span class="number">100.0</span>;

      <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> dx <span class="operator">=</span> <span class="operator">::</span>sin(angle) <span class="operator">*</span> <span class="number">10</span>;
      mouseEyeDirection <span class="operator">=</span> (<a href="../qtcore/qtglobal.html#qAbs">qAbs</a>(dx <span class="operator">/</span> <span class="number">5</span>) <span class="operator">&lt;</span> <span class="number">1</span>) <span class="operator">?</span> <span class="number">0</span> : dx <span class="operator">/</span> <span class="number">5</span>;

      setRotation(rotation() <span class="operator">+</span> dx);
      setPos(mapToParent(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span>(<span class="number">3</span> <span class="operator">+</span> sin(speed) <span class="operator">*</span> <span class="number">3</span>)));
  }

</pre>
</div>
<!-- @@@graphicsview/collidingmice/mouse.cpp -->
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